Reiskin was the Bajoran Starfleet officer identity assumed by a member of Species 8472 in 2375. She trained at Terrasphere 8 for infiltrating the Federation.
In that recreation, Reiskin and her comrade, Young, were assigned to Orbital Flight Control by Admiral Bullock to monitor incoming ships from the Bolian sector. (VOY: "In the Flesh")
It is unclear if there is a real Reiskin in Starfleet or if the persona was created by Species 8472.